John Carradine as Dr. Rynning

Robert Dix as Dr. Manning

Vicki Volante as Valerie

Joey Benson as Willy

Jennifer Bishop as Lian Malian

Bruce Powers as Cmdr. Steve Bryce

Fred Meyers as Bob Scott

Britt Semand as Linda

Al Adamson as Earthly Vampire (uncredited)

John Andrews as Man in Warehouse (uncredited)

John "Bud" Cardos as Vampire Caveman (uncredited)

Theodore Gottlieb as Opening Narrator (voice) (uncredited)

Gary Graver as Earthly Vampire (uncredited)

Sean Graver as Boy with Mother (uncredited)

Maria Lease as Girl with Purse (uncredited)

Gus Peters as Earthly Vampire (uncredited)

Irv Saunders as Earthly Vampire (uncredited)